Looper-operating mechanism for sewing-machines.



ONDERDUNK. LOOPEE. OPERATING MECHANISM FOR SEWING MACHINES.

APPLICATION FILED JULY 9, 1907.

Patented. Jan. 5, 1915.

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PrlllllrlllI-IIIIAFIII Ill lfilllnll lllll Llllll L. ONDERDONK'. LOOPER OPERATING MECHANISM FOR SEWING MACHINES.

APPLIOATION FILED JULY 9, 1907.

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L. ONDERDONK.

LOOPER OPERATING MECHANISM FOR SEWING MACHINES.

APPLICATION FILED JULY 9, 1907. 1 18 5'Y Patented (12111.5, 1915.

3 SHEETS'SHEET 3.

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LANSING ONDERDONKT, OF NEW YORK, N. Y., ASSIQNOR T0 UNIONSPEGIAL MACHINE COMPANY, OF CHICAGO, ILLINOIS, A CORIPQB-A'IION OF ILLINOIS.

V LOOPER-OPERATING MECHANISM FOR SEWING-MACHTNES.

madam.

Specification of Letters Patent.

Patented Jan. 5., 11915..

Application filed July 9, 1907. Serial No. ceases.

To all whom it may concern:

Be it known that I, LANSING @NDERDQNK, a citizen of the United States, residing at New York, in the county of New York, State of New York, have invented certain new and useful Improvements in Lo0per- @perating Mechanisms. for Sewing-Ma-- chines, of which thefollowing is-a description, reference being had to the accompanying drawing, and to the letters of reference marked thereon.

My invention relates to new and useful improvements in sewing machines and more especially to the looper operating mechanism therefor.

The object of my invention IS to provide a. looper operating mechanism wh ch shall be positive in its movements and simple 1n construction.

My invention consists in the parts, 1mprovements and arrangements here nafter shown, described and set forth 1n the claims. i

In the drawings which show by way of illustration one embddiment of my invention, Figure 1 is a front elevation of a sewing machine, hav ng my mproved looper operating mechan sm applied thereto,'certain parts being broken awav for the sake of clearness. Fig. 2 is a bottom plan view of a sewing machine showing the'looper operating mechanism. a portion of the feeding mechanism being broken awav for the sake of clearness. Fig. 3 is an end view of a portion of the sewing machine, showing the looper operating mechan sm. Fig. 4 1s a detail top plan view showing the looper and its operating le er and in'dotted lines the same parts in a different position. Fig.

5 is a detail perspective view of my preferred form of looper.

The bed plate 1 has rising therefrom, an overhanging arm 2. carrying the usual needle mechanism at its forward end. The

main shaft 3. mounted in the overhanging arm, is rotated b suitable means and power is transmitted from said mam shaft 3 to a shaft 4, mounted underneath the work support or bed plate 1. by a belt 5. Said belt engages suitable pullevs 6 and 7 mounted upon the shafts 3 and 4, 'respectivelv. Y

The looper is. carried by an upright looper support 7. which is mounted in a' bracket 8. secured to the under. side of the and figures.

.link 19 which ted support 7, prevents the looper support '70 from moving vertically in the bracket 8.

The looper support 7 is formed with a re cess in its upper end in which is set the shank of the looper 145 The looper shank 14 is bent laterally and upwardly and thence curved as at 15 to lie substantially in the arc of a circle the center of which is the axis of the looper support 7. The bracket for supporting the looper is so disposed that the looper in its movements, moves outs de of the needle 16 as shown in Fig. 4.

The looper support 7 has' an arm- 17 secured thereto between the bracket arms 9 and 10. Said arm 17 is pivoted at 18 to a in turn is pivoted at 20 to a lever 21 fu'lcrumed upon a stud 22 formed on a depend ng lug 93. carried bv the bed plate 1. The opposite end of the arm 21 carries a ball stud 24 which is connected-by a link 25 to a ball stud 26 carried by a crank a m 27 on the end of the shaft 4. As theshaft 4 is rotated. the crank a m 27 through the l nk 25. will ibrate the lever 21 about its fulc um 22. The d spos t on of the lever 21, and the looper is such that as the lever is v brated f om a position shownin dotl nes in Fig. 4 to the pos tion shown in full l nes. the i otal connect on 20 between said le er and the link 19 will cross a line passing through the fulcrum point 29 of the lever an the ax s of the pivotal connect on 17 between the leve and the ink "19 (see dotted line Fig. 4). When A nut 12 together the lever 21 is in the position shown in dot ted line in F g. 4. the looper is at the rear end of its st oke and the po nt of the looner stands slightly in rear of the needlepath. As the needle rises to throw out its loop, the loo er mo es forw d into a d loop as shown in full l nes in Fig. 4. The loo er is g ven an extended dwell at the forward end of its-stroke. owing to the fact that the pivot point 20 between the l nk 19 and the leve 21. moves across. the line a: shown in Fig. 4. As the pivotal connect on 20 approaches this line. the speed of the looper decreases until said looper is brought to a stand-still and the movement of the pivotal connection 20 beyond the line arr-m practically gives little or no movement to the looper, and therefore. the extended dwell at the forward end of the stroke of the looper is secured. I

When the looper stands at the forward end of its stroke as shown in Fig. 4, the looper thread 28 extends from the eye of the looper to the previous stitch, and owing.

to the curve of the looper, the looper thread is held at one side of the needle path, so that the needle may pass with certainty between the looper thread and the body of the looper. After the needle has entered the looperthread loop the looper is then retr'acted'quickly to the rear end of its stroke. 7

From the above description, it will be noted that I have provided a looper which moves in a single path in a horizontal plane,

, and that said looper moves quickly forward necting link 25 between said shaft and the.

lever 21, is such that when the looper is at the forward end of its stroke, said crank isv into the needle loop, where it is given an extended dwell, while the needle rises and descends again into the looper thread loop I an-dafter the needle has entered the looper thread loop, said looper is moved readily to shed the previous needle loop and into such position as to enter the new loop thrown out by the needle.

' It will be noted. that the position of the crank 27 on the shaft 4, relative to the conpassing the dead center on the side of the shaft opposite the position of the lever 21, and. therefore, said crank is at this time passing its slow center and the necessary dwell .in the throw of the crank at this time is added to the dwell caused by the pivot point 18 crossing the line H. On the other hand, the crank 27 when the loop is at the rear end of its stroke is passing its quick dead center. and the rapid movement imparted to. the link at this time is added to the rapid movements caused by the position' of the link 19 relative to the looper carrier and the operating lever 21.

- Having thus particularly described my invention. what I claim as new and desire to secure by Letters Patent, is:

1. A sewing machine including in combination, a work support, a rotary shaft mounted beneath the work support. a needle, a looper,'means for supporting said looper, whereby the same moves about a fixed axis substantially parallel with the needlepath, said looper being curved about said fixed axis as a center, means for operating said looper from said shaft beneath the work into and out of alinement. said looper being at the forward end of its stroke when said link and lever are in alinement.

2. A sewing machine including in combination, a work support, an overhanging arm, a main shaft mounted on the overhanging arm, a rotary shaft mounted beneath the work support, means for transmitting motion from the main shaft to said last named shaft, a needle, a curved looper, means for supporting said looper, whereby the same moves about afixed axis si1bstantially parallel with the needle path, and means for operating said looper, including a lever, means for connecting said lever to said rotary shaft, and a link connecting said lever to said looper, said link and lever being so disposed as to move into and out of alinement whereby to give an extended dwell to the looper at the forward end of its axis parallel tothe axis of the looper, a

link for connecting said lever to said rotary shaft, and a second link for connecting said lever to said looper, said second link and said lever being so disposed as to give an extended dwell tothe looper at the forward end of its stroke.

4. A sewing machine including in combination, a work support, a rotary shaft mounted beneath the same, a needle,a looper moving in a. plane substantially at right angles to the path of the needle, a bracket supporting said looper, a lever pivoted to the underside of said work support and moving in a plane substantially parallel thereto, a link connecting said lever to said looper and meansfor connecting said lever to said rotary shaft, said link and lever being so disposed as to be substantially in line when the looper is at the forward end of its pr0 ecting arm on said looperfsupport. and

means between said lever and said rotary shaft, for oscillating said lever.

6. A sewing machine including in combination a work support, a rotary shaft mounted beneath said work support, a crank 11,123,577 tau:

carried by the forward end of said rotary shaft, a needle, a looper moving in a plane substantially at right angles to the path of the needle, a support for said looper, a lever pivoted to the under side of said work support, and connected to said looper, and a link connecting said lever and said crankon the rotary shaft.

7. A sewing machine including in combination a Work support, a rotary shaft mounted beneath said Work support and having one end thereof located centrally of said work support, a crank arm carried by the end of said rotary shaft, a needle, a looper moving in a plane substantially at right angles to the path of the needle, a support for said looper, a lever pivoted to the under side of said Work support, means for connecting one end of said lever to said looper, a ball stud carried by the opposite 20 LANSING ONDERDONK.

Witnesses:

R. S. OSWALD, WM. E. HAND. 

